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LTC4418 - using INTVCC to power external low-power circuitry

Thread Summary

The user asked if it is permissible to draw a small amount of external load current from the INTVCC pin of the LTC4418 to power low-power external components. The final answer from Analog Devices states that it is not recommended to draw current from INTVCC, as it is intended for internal use by the IC.

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Category: Hardware
Product Number: LTC4418

Hello, I'm designing a power priority switch using the LTC4418 and I have a question regarding the INTVCC pin.

In the typical application circuit, INTVCC is only shown with a 100 nF bypass capacitor to GND, and the datasheet describes it as the internal 3V3 regulator output used by the IC itself.

My question: Is it permissible to draw a small amount of external load current from INTVCC to supply low-power external components, such as:

  • A small logic gate or buffer
  • Pull-ups for logic signals
  • A low-power microcontroller in sleep / idle mode
  • etc

If yes, what is the maximum recommended external load current on INTVCC without affecting LTC4418 operation?

Thank you in advance for any guidance.

Best regards,

Milan

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